If you develop a good Profit & Loss Statement for your existing business for the current year or for the first year of your proposed business, you can use this data to actually project how much sales you would need to yield the income you want and the profit margin you want. You can plan ahead as far as you want. Sound impossible? It's actually pretty simple and can be pretty accurate plan.
What are the critical steps needed to achieve a successful business plan? This may come as a surprise to my fellow business consultants, but producing a successful business plan is not as difficult as people often think, so long as they follow a logical sequence. Here is my considered view as to the critical steps. 1. Understand what you are planning and why; 2. Define the activities of your organisation; 3. Outline the current position of the business; 4. Review and discuss the external market conditions, undertake and understand a competitive analysis, and define your market positioning; 5. Define your core objectives; 6. Prepare and articulate the strategy to attain and meet the objectives; 7. Identify and review risks and opportunities; 8. Prepare a strategy to deal with risks and exploit opportunities; 9. Refine the strategies into operational plans; 10. Prepare financial forecasts including revenues, costs, cash_flow, capital expenditure and assumptions adopted; 11. Finalise the plan; 12. Get it approved; 13. Use it; 14. Review it regularly and update as appropriate.